/Engine/Source/Runtime/Engine/Classes/Kismet/KismetMathLibrary.h
Find a local rotation (range of [-180, 180]) for an object with StartTransform to point at TargetLocation. Useful for getting LookAt Azimuth or Pawn Aim Offset.
static FRotator FindRelativeLookAtRotation ( const FTransform & StartTransform, const FVector & TargetLocation )